This is an interesting study: Parsons Island, Maryland: Synthesis of Geoarchaeological Investigations, 2013-2020
They found evidence of camel blood on one of the artifacts that predates Clovis. It’s a long scientific read and I’m glad there are pictures and drawings.
Camels and horses were killed off during this period, ensuring isolation, disease susceptibility, and lactose intolerance, among things, for North American Indians.
Ooh, thanks!